CSR plc (formerly Radio Cambridge Silicon) is a multinational semiconductor company based in Cambridge, UK. Its main products were communication, sound, photography and site chips. CSR was listed on the London Stock Exchange and was a component of the FTSE 250 until Qualcomm acquired it in August 2015. Under Qualcomm's ownership, Qualcomm Technologies International, Ltd. was founded in 1998 and split away from Cambridge Consultants as Cambridge Radio Silicon radio or CSR in 1999. The founding directors, all of whom were at Cambridge Consulting at the time, were O'Donovan, James Collier and Glenn Collinson. First listed on the London Stock Exchange in 2004.In 2005, the company acquired Clarity Technologies, a leading voice capture company (CVC) and UbiNetics, a wireless 3G technology company (WCDMA/UMTS/HSDPA). In 2007, CSR acquired Nordnav, a Swedish-based GPS software company, and CPS, a Cambridge-based GPS software company that produces augmented GPS in partnership with Motorola.In February 2009, csr announced that it was merging with Serv, the world's largest supplier of GPS chips, in a $136 million stock deal. In July 2010, CSR announced the acquisition of Belfast-based APT Licensing Ltd (APTX) and APTX audio technology in February 2011, and CSR announced that it was merging with Zoran, a video and imaging technology company. In May 2012, responsibility was obtained Social companies on Digital Feedback Direct Speaker Technology (DDFA), a highly scalable digital audio speaker technology; Trident Microsystems, in July 2012, Samsung Electronics agreed to acquire a corporate mobile phone connection (Bluetooth Wi-Fi), GPS/GNSS and associated IP for the United States for $310 million (£198 million). As part of the deal Samsung acquired a 4.9% stake in CSR. In June 2014, CSR acquired people and technology at Reciva, a web-based audio streaming platform, for $5 million, and in October 2014, Qualcomm was agreed to csr for $2.5 billion. The deal was completed in August 2015.